Contents

trait BankAccount {

  def closeAccount(): Unit

  def getBalance: Option[Int]

  def incrementBalance(increment: Int): Option[Int]
}

protected case class Account(var balance: Option[Int] = Some(0)) extends BankAccount {

  private def runThreadSafe[A](block: => A): A = this.synchronized(block)

  override def closeAccount(): Unit = runThreadSafe(balance = None)

  override def getBalance: Option[Int] = runThreadSafe(balance)

  override def incrementBalance(increment: Int): Option[Int] = runThreadSafe {
    balance flatMap { amount =>
      balance = Some(amount + increment)
      balance
    }
  }
}

object Bank {
  def openAccount(): BankAccount = Account()
}

Version data entries

370 entries across 370 versions & 1 rubygems

Version	Path
trackler-2.2.1.159	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.158	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.157	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.156	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.155	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.154	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.153	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.152	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.151	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.150	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.149	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.148	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.147	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.146	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.145	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.144	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.143	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.142	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.141	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.140	tracks/scala/exercises/bank-account/example.scala